national security agencies is gathering billions of records from mobile phones around the world. that's according to leaked top secret documents given to the washington post by whistleblower edward snowden. it is said to track the movement of people in ways previously unimaginable. they use code traveller to map relationships and movements. american oticials say what they said was legal and reports were used on what they call foreign targets. civil rights campaigner say it's a breach of privacy. >> you are walking along minding your business thinking you'd never be of interest. if you have one of these there's every possibility that they are tracking where you've been and who you were speaking to. according to new documents, it's revealed that the american spy agency is somewhere snt region of the 5 billion pieces of information. here is how it works. you identified as an intelligence target. it's sending out signals as you are walking around. it can work out where you've been and who you've been speaking to. and if they also have a mobile phone. when you go online you may be abl